Gumming machine



G. l. URQUHART GUMMING MACHINE Oct. 25, 1966 4 Sheets-Sheet 1 Filed Feb. 15, 1963 INVENTOR.

GLEN URQUHART ATTORNEYS FIGIO G- I. URQUHART GUMMING MACHINE Oct. 25, 1966 4 Sheets-Sheet 2 Filed Feb. 15, 1963 INVENTOR. GLEN URQUHART FIG?) ATTORNEYS G. l. URQUHART GUMMING MACHINE Oct. 25, 1966 4 Sheets-Sheet 5 Filed Feb. 15, 1963 INVENTOR. GLEN UROUHART BY WW ATTORNEYS FIGB G. I. URQUHART GUMMING MACHINE Oct. 25, 1966 4 Sheets-Sheet 4 Filed Feb. 15, 1963 FIG. I3

INVENTOR.

GLEN URQUHART ATTORNEYS United States Patent 6 3,280,793 GUMMHNG MACHINE Glen 1. Urquhart, Southhoro, Mass, assiguor, by mesne assignments, to New Jersey Machine Corporation, Hoboken, N .J a corporation of New .l'ersey Filed Feb. 15, 1963, Ser. No. 258,738 12 Claims. (1. 113-293) This invention relates to a glue applicator and more particularly comprises a new and improved high speed gluing machine for applying a registered pattern of cold adhesive to a sheet of paper or board.

One important object of this invention is to provide a relatively inexpensive and dependable glue applicator which may be conveniently adjusted so as to vary the registration of the adhesive pattern to the sheet stock to which it is applied.

Another important object of this invention is to provide a stencil type of gluer which averts glue-offset during intermittent sheet feeding.

Another important object of this invention is to provide a gluer which continuously circulates the adhesive when the machine is temporarily shut down so as to prevent the adhesive from setting in the storage compartment of the machine.

Another important object of this invention is to provide a gluer which is capable of handling a wide variety of cold gum and pastes, including latex.

Still .another important object of this invention is to provide a feed for a gluer, which can handle an extremely wide range of stock thicknesses and stock with irregular surf-aces without skipping or crushing the stock.

Yet another important object of this invention is to provide a gluer that employs as a stencil one of the actual sheets to which glue is to be applied.

To accomplish these and other objects the gluer of this invention includes among its features a frame which carries a generally horizontal conveyor at one end of which is the gum drum and at the other end of which is the feeding device for depositing blank sheet stock singly on the conveyor. The conveyor delivers the sheets in timed relationship with the glue stencils carried on the drum so that each sheet is provided with the same application. The gluer also includes pickup, doctor and transfer rolls which operatively connect a gum box or reservoir and the gum drum so as to apply a metered amount of adhesive to the drum during each revolution. Drive means are provided for rotating the drum, feeding device, conveyor and rolls, and an auxiliary drive means is provided to maintain circulation of the gum in the reservoir when the primary drive means is momentarily inactivated. Means are also provided as part of the machine for adjusting the position of the drum relative to the conveyor so as to vary the relationship between the delivery of sheets by the conveyor and a reference line on the drum.

These and other objects and features of the present invention along with its incident advantages will be better understood and appreciated from the following detailed description of one embodiment thereof, selected for purposes of illustration, and shown in the accompanying drawings, in which:

FIG. 1 is a side view of a gluer constructed in accordance with this invention;

FIG. 2 is an enlarged fragmentary view of the glue applicating end of the machine shown in FIG. 1;

FIG. 3 is a diagrammatic view illustrating the drive system of the machine shown in FIG. 1;

FIG. 4 is a fragmentary side view of the feed end of the machine shown in FIG. 1;

FGI. 5 is a perspective View of a portion of the feed mechanism shown in FIG. 4;

3,289,793 Patented Oct. 25, 1966 FIG. 6 is a fragmentary perspective view of the gum drum forming part of the applicating device shown in FIGS. 1 and 2;

FIG. 7 is a detail view of a portion of the gum drum assembly shown in FIG. 6;

FIG. 8 is a side view of a portion of the conveyor and.

wash-roller assembly of FIG. 2;

FIG. 9 is a cross-sectional view taken along the corresponding section line in FIG. 8;

FIG. 10 is a fragmentary cross-sectional view of the glue transferring portion of the applicating assembly;

FIG. 10A is a fragmentary perspective View of the mechanism shown in FIG. 10;

FIG. 11 is a cross-sectional view of the conveyor forming part of the machine of FIG. 1;

FIG. 12 is a bottom perspective view of a portion of the conveyor shown in FIG. 11;

FIG. 13 is a fragmentary top view of the conveyor shown in FIGS. 11 and 12; and

FIG. 14 is a perspective view, partially cut away, of the glue applicator pad.

The gluer shown in FIG. 1 is organized about a frame 10 supported on legs 12 on the floor. The machine includes a glue applicating assembly 14 on one side of the frame, a feed assembly 16 on the opposite side of the frame and a convey-or 18 which transports stock from the feed assembly 16 to the applicator assembly 14. The drive assembly 20 for operating the several parts of the machine is shown diagrammatically in FIG. 3.

The glue applicator assembly 14 shown on the left side of the frame it in FIG. 1 includes a main gum drum 22 rotatably mounted on shaft 24 in turn supported on pillars 26 forming part of the frame 10 dispose-d adjacent the gum drum 22 and above the conveyor 18 is a gum box 28, and a pickup roll 3% extends across the box and is partially submerged in the gum in the box. A doctor or metering roll 32 tangentially engages the pickup roll 30, and a transfer roll 34 also tangentially engages the pickup roll and contacts the gum drum 22 to transport the adhesive from the pickup roll to the gum drum. An adjustment for the doctor roll which enables it to be moved so as to vary the quantity of glue applied to the drum 22 is described in detail below.

The pick-up, doctor and transfer rolls are each mounted on a pair of pivotally mounted arms 36 carried on brackets 38 mounted on the posts 49. The pivotal freedom of the arms 36 on the brackets 38 enables the rolls to be moved from the horizontally aligned position shown in FIG. 1 to a position wherein they are aligned substantially vertically above the gum box 28. In the raised position the rolls may conveniently be removed from the machine or be cleaned in place and in the elevated positin the gum box can be removed from the frame for cleaning or refilling. A crank is mounted on the fixed plate 37 on the top of the posts 40 and its arm 35' engages the lower side of the free end of the arm 36. Thus, when the crank is turned clockwise slightly as viewed in FIG. 1, the transfer roll 34 moves off the drum 22 to stop application of adhesive to the drum.

In FIGS. 10 and 10A the doctor roll adjusment is shown in detail. It will be noted in that figure that the doctor roll is supported in eccentric bearings 32' and the bearings are mounted for rotation in the arms 36. Thus, by rotating the bearing 32 the doctor roll can be moved away from the pickup roll to vary the amount of glue picked up in the roll 30 and carried to the transfer roll. To facilitate the adjustment a rotatable shaft 31 is mounted between the arms 36 parallel to roll 32 and forms part of a crank with the link 33 connected eccentrically to the eccentric bearing 32' of the doctor roll 32. (It is to be understood that the same arrangement is provided at each arm 36 at both ends of doctor roll 32 and shaft 31.) A handle knob 137 is shown in FIG. 2 on the end of the shaft 31, and the position of the doctor roll 32 may thus be varied merely by rotating the handle which through link 33 rotates the bearing 32' to move the axis of the doctor roll toward or away from the pickup roll 30.

Disposed beneath the gum drum 22 and forming part of the applicator assembly 14 is a wash-roller 42 positioned to tangentially contact the surfaces of the applicator pads 43 carried by the gum drum. The wash-roller 42 is in turn partially submerged in a water box 44 and has associated with the exposed periphery thereof a doctor blade 216 (note FIG. 2). The wash-roller 42 below the large gum drum washes the surfaces of the gum drum pads 43 whenever it comes into direct contact with such surfaces because no sheet stock is passing between the drum 22 and such wash-roller and thus averts glue off-sets which would otherwise occur during intermittent feeding of sheets to the drum.

The wash-roller assembly is shown in detail in FIGS. 8 and 9. It will be noted that the roller 42 is keyed to the shaft 45 for rotation therewith, but the roller can move axially on the shaft along with the water box 44 and clamp assembly 47 connected to the box. Nylon bearings 49 secured to the inner surfaces of the ends of the box bear against the sides of the wash-roller. The clamp 47 secured to the box 44 slides on the cross bar 51 forming part of the frame, and by tightening the screw 53 of the clamp against the bar the entire assembly becomes fixed, and the assembly may be moved merely by loosening that screw. Thus, the wash-roller 42 and water box 44 can be moved to any position on the shaft 45 merely by loosening the screw 53 and again tightening it after the desired position is reached.

The feed assembly 16 includes an inclined feed table and a suction-friction wheel 52. The inclined table 50 has a pair of side walls 54 (one shown in FIG. 1) between which the sheet stock is piled on the table. The suction-friction wheel 52 contacts the uppermost sheet in the stack and serves to strip the top sheets one at a time from the table 50 and deposit them on the conveyor 18.

The wheel 52 is shown in FIG. 5 to include a heavy rim 56 and a web 58 cut away in each quadrant at the location of holes 60 on the outer surface of the rim 56. Each hole is lined with a rubber sleeve 55, and the sleeves extend out of the holes a few thousandths of an inch beyond the rim so as to frictionally engage the sheets and push them through the feeding device onto the conveyor. The lined holes 60 extend through the rim 56 of the wheel and each may be connected to a vacuum pump 62 mounted adjacent the motor 64 on the bottom of frame 10, by means of one or more flexible tubes 66. It will be noted in FIG. 5 that the openings 60 are provided in groups of three and in use ordinarily one of the openings is connected to the vacuum pump by the tube through the rotary valve 67. The valve which may be of conventional design connects the tube to the vacuum source as the hole to which it is connected overlies the top sheet and breaks the connection when the sheet is on the conveyor so that it does not follow about the wheel. The rubber sleeves in the other holes will scuff the sheet forward to assist the vacuum in transporting the sheets to the conveyor. Another of the holes in the group may be connected to the vacuum pump if the stock being fed is particularly stiif or heavy. A pickup roll 68 cooperates with the wheel 52 to move the stock to the conveyor while a rubber retarder 69 on the bottom of the rear side of the wheel holds back the sheets immediately beneath the top sheet to assist single sheet feeding. It is to be understood that one set of holes 60 is used with sheets of at least a particular size, and with smaller sheets two or four sets of holes 60 may be employed to feed the stack more rapidly to the conveyor.

The conveyor 18 includes a pair of parallel gauge chains 80 which run through a generally triangular course defined by the shaft 104 (see FIG. 3) of pickup roll 68 a pair of pull rolls 82 (see FIG. 8) and stretcher shaf' 84 shown in FIG. 1 to be disposed intermediate the end: of the frame. The chains carry three pairs of pins 8( which are adapted to engage the trailing edge of the shee' stock deposited on the conveyor by the feed wheel 52 anc carry them to the applicator assembly 14 and precisel; align each sheet with respect to the drum 22 as it is being conveyed. The details of the conveyor 18 are shown it FIG. 13 and are described separately below.

The applicator assembly 14, the feed assembly 16 ant the conveyor 18 are all driven by the system shown ir FIG. 3. The primary device is provided by the motor 64 whose shaft carries a sprocket 102. Shaft 104 whicl carries the pickup roll 68 also carries a sprocket 106, ant the motor 64 drives the sprocket 106 through its owr sprocket 102 and chain 108. Shaft 104 also carries gea1 110 which registers with gear 112 carried on shaft 2 which in turn supports the feed wheel 52.

Shaft 104 carries a second sprocket 114 which drives chain 116 also engaging the sprocket 118 carried on shaf' 45 that rotatably supports wash roll 42. Shaft 45 car ries another sprocket 122 which drives chain 124 which ir turn meshes with three sprockets 126, 128 and 130. The sprocket 126 is carried on shaft 132 which in turn supports the lower of the two pull rolls 82; the sprocket 121 is mounted on shaft 134 which in turn carries anothe1 sprocket 136 that forms part of another drive sub-as sembly described below; and the sprocket is merely an .idle, wheel to maintain the chain 124 in contact witl the sprocket 128.

It will be noted in FIG. 3 that the shaft 134 carries be tween sprockets 128 and 136 a slip clutch 140 for reason: which will become clear below. The sprocket 136 is con nected to another sprocket 142 through chain 144, and tilt sprocket 142 is carried on shaft 146 which in turn carrie: gear 148 that drives gears 150 and 151 connected to tilt pickup roll 30 and the transfer roll 34, respectively Thus, the pickup and transfer rolls rotate in the same di rection (clockwise as viewed in FIGS. 2 and 3) and nt pool collects between them where they meet tangentially The doctor roll also is driven in this same assembly by means of its gear 151' which meshes with the gears on th pickup roll.

An auxiliary motor is also provided as part of the drive mechanism and its chain and sprocket 162 register: with another sprocket 164 carried by shaft 146. A sec ond clutch 165 is disposed on the shaft 146 and physicall; connects the two portions of the shaft 146 which carry sprockets 142 and 164. Either the motor 160 and it: chain and sprocket 162 or the chain 144 driven by sprocket 136 can serve to rotate the rolls 30, 32 and 34 that form part of the assembly for transferring gum frorr the gum box 28 to the gum drum 22. The auxiliary motor 160 is designed to rotate the rolls 30, 32 and 34, a a reduced speed as compared to the rate of rotation im parted to them through the chain 144 originating frorr the primary motor 64. When the auxiliary motor 16( takes over upon temporary shut down of motor 64, tht friction clutch 140 effectively detaches the rolls 30, 32 anc 34- from the remaining portion of the assembly so tha' the entire load of the system is not placed upon the auxiliary motor. In this manner the gum in the drum may be agitated by the rollers in direct contact with it when temporary shut down of the remaining portion of the systerr occurs with shut down of motor 64. The clutch 165 0: course effectively disconnects the motor 160, chain anc sprocket 162 and sprocket 164 from the remainder of the system when the primary motor 64 drives the machine Thus, the auxiliary motor does not constitute an effectiw load on the system during normal running of the machine The drive assembly 20 also includes a gear carrier on the shaft 45 of the wash-roller 42, which registers witl a second gear 172 on the shaft 24 which supports the gun drum. As suggested earlier and described in detail below,

the drum 22 may be moved rotationally a limited amount relative to the shaft 24 to vary the relationship of the drum with conveyor chains St).

The conveyor chains 80 travel about a run defined by the sprockets 180 carried on the lower shaft 84, sprockets 182 carried on shaft 184, and sprockets 186 carried on shaft 164 on each side of the pull roll 68. Shaft 184 also carries a sprocket 188 connected by chain 190 to the sprocket 192 on the shaft 45 of the wash-roller. Thus, rotation of the wash-roller (and the gum drum) drives the chains 88 causing their pins 86 to deliver the sheet stock deposited on them.

The conveyor chains 80 form but one part of the larger conveyor assembly shown in detail in FIGS. 1113. The conveyor assembly is disposed between the sides of the frame 10 and as described serves to transport the sheet stock from the feed assembly 16 to the gum applicating assembly 14 at opposite ends of the machine. The conveyor assembly includes a pair of parallel tables 248 and 242 which run lengthwise of the machine and are supported intermediate their ends by the cross frame member 244 extending between the frame sides 10'. Each table 240 and 242 is provided with a longitudinally extending recess 246 which houses the chain associated with it so that the upper surface of the chain lies in the plane of the upper surface of the table.

In FIG. 12 it will be noted that each table 240 and 242 has its own bracket 248 which supports it for transverse sliding movement on the member 244, and a pair of screw shafts 250 and 252 extend between the sides 10 of the frame and are threadably secured to the respective brackets of the tables 240 and 242. The shafts 250 and 252 are actuated separately, and a crank wheel 254 is provided which fits onto the end of either of the shafts to turn each. Thus, when the shaft 258' is rotated by the wheel 254 mounted on its in FIG. 12, the table 240 will move on the member 244 toward one side of the frame or the other. Similarly the table 242 may be moved by placing wheel 254 on shaft 252 and rotating it.

The chains 80 in their respective recess-es are designed to move with their tables between the sides 10'. This occurs because the ends of the tables 240 and 242 effectively surround the sides of the sprockets 182 and 186 which define the upper runs of the chains and which sprockets are themselves slidably mounted axially on but keyed for rotation with the shafts 184 and 104, respectively. Similarly, the stretcher sprockets 180 on shaft 84 must be tied in any suitable manner as indicated in FIG. 1, to the tables 248 and 242 so that they move translationally with the tables across the frame. Thus, merely by turning wheel 254 on the appropriate shaft the ables and their associated chains can be moved to the position desired.

Disposed above the tables and suspended from bridges 256 are tWo pairs of angles 258 and 260. The outer of the angles 258 serve as side guides for the sheet stock pushed by the pins 86 carried by the chains across the tables, while the angles 260 overlie the course of the sheets and serve to retain them on the table and prevent them from bowing or otherwise elevating so that they can not skip over the pins as the sheets are moved along the tables. In FIG. 11 the angles are shown carried on the lower ends of stems 262 in turn suspended from the brackets 264 slidably mounted on the bridge. Each of the brackets has its own adjusting nut so that they may be slid from one side to the other over the tables to assure proper positioning of the side guides and retainer angles regardless of the position of the tables, and the width of the stock. Moreover, the retainer angles 260 can be raised on their stems to compensate for different weights of stock.

Having described the drive assembly 20 and conveyor 18 in detail and described in more general terms the applicator assembly and feed mechanism, some of the details of the latter two assemblies will now be presented. The gum drum 22 shown in FIG. 6 carries a number of engraved parallel longitudinally extending lines 200 which are identified by numbers representing inches about the periphery of the drum as suggested at 202. The lines 202 serve as reference lines to establish a relationship between the drum rotation and the gauge chain conveyor. The reference lines 200 provided on the drum serve as guides for mounting the stencil pads or applicators on the drum so as to correlate their position with the trailing edge of the sheet stock being pushed by the pins 86 as part of the gauge chain.

In FIG. 6 it will be noted that a sheet 279 is secured to the surface of the drum with its trailing edge 272 aligned with the scored line marked 12 at the margin of the drum. The numbers indicate that a stencil sheet of that particular number of inches in length should be mounted on the drum with its trailing edge lying along the particular line marked with that number. Thus, if the stencil is 15 inches in length, its trailing edge would be positioned with its trailing edge against the line marked 15.

The stencil itself may be one of the sheets upon which the gum is to be applied. For. example, if the adhesive is to be applied to sample cards of fabric swatches and the gum is to adhere the swatches to the card, one of the actual cards may be used. The card used as a stencil is provided with applicator-pads over the reverse side of each of the areas which is to receive adhesive, the pads themselves being cemented to the card, and the trailing edge of the card is aligned with the line corresponding to the card length. Masking tape or other similar material may be used to secure the card stencil face down to the drum. Because the pads are thus arranged in a reverse layout on the stencil card, the pads will apply the adhesive in the desired pattern to the face of the cards directed face up between the drum and the wash roller.

Means are provided in the machine to make fine adjustments of the drum position relative to the chain so that precise alignment of the stencil and sheet stock fed through the machine can be achieved without lifting the drum to disengage the drive gear 172 of its shaft 24 from the gear 176 and without moving the stencil 270 on the drum. In order to achieve this, the shaft 24 which extends axially through the drum 22 carries a radially extending bracket 204. The bracket and its associated parts are clearly shown in FIGS. 6 and 7. The bracket 204 is provided with an elongated slot 286 generally perpendicular to the radial direction of the bracket, and a rod 268 fixed to the end wall 210 of the drum extends through the elongated slot 286. A pair of axially aligned adjusting screws 212 and 214 mounted on opposite sides of the bracket extend into the opposite ends of slot 206, and the threaded ends of the adjusting screws engage the rod 238. The drum 22 which is not otherwise keyed to shaft 24 and therefore may be rotated relative to it, is held in a fixed position relative to the shaft by means of the bracket 2G4, rod 208 and adjusting screws 212 and 214. It will be appreciated that by loosening one of the two adjusting screws and tightening the other the rod 208 may be shifted to one side or the other of the slot 206 so that the relative angular position of the drum 22 and the shaft 24 may be varied. Because the shaft 24 has a fixed timed relationship to the gauge chain pins 86, rota tion of the drum 22 on the shaft 24 changes the registration of the stencil 270 carried on the drum with the sheet stock fed by the chains 88. Thus, by a simple adjustment the relationship between the stencils or applicators and the sheet stock fed by the gauge chain may be varied.

In FIG. 14 one applicator pad 43 is shown in detail. The pad is preferably made of a heavy foam central layer 43a sandwiched between smooth soft rubber skins 43-12. The foam and soft skins allow the pad to conform to the irregular surfaces of the sheet stock being processed such as corrugated paper without applying a heavy load which would cause the flutes to collapse. The skins 4% close the pores of the foam to prevent the pads from becoming saturated so as to make it difficult to control the quantity of adhesive applied to the sheets which pass between the drum 22 and the wash-roller 42.

In FIG. 2 the applicator assembly 14 is also shown to include stripper bars 220 which extend inwardly between the wash-roller and gum drum. The strippers 220 are biased by spring 222 to a position wherein they engage the drum surface and prevent the sheet stock from turning on and winding upon the gum drum after it has passed between the drum and wash-roller. Rather, the strippers direct the stock down the discharge chute 224.

In operation the assembly shown functions as follows:

Assume that envelope blanks are to be appropriately coated with adhesive along the sides and flap so that the envelope may be permanently formed and be provided with adhesive on the flap available for use by the ultimate consumer. The sheet stock is stacked on the feed table 50 between the side walls 54, and the vacuum pump 62 is connected to the appropriate sleeve in one opening 60 in the periphery S6 of the vacuum-friction wheel 52. The stencil which .will be one of the envelope blanks is applied to the drum 22 with its trailing edge aligned with the particular engraved reference line 200 provided on the drum corresponding to the envelope blank length. It should be noted that circumferential reference lines may also be provided on the drum to aid in the positioning of the stencils from the drum ends. The position of the drum may be adjusted both circumferentially by the screws 212 and 214 and axially on the shaft 24, and corresponding adjustments should be made on the conveyor tables, wash-roller and bath. Other adjustments may be made to vary the space between the pull rolls 82 and between wheel 52 and roll 68 to compensate for the thickness of the envelope blanks. Moreover, if the trailing edge of the envelope blank-s is not normal to the chains 80, the pins 86 on one of the chains may be positioned in different chain links so that they will push the blanks straight along the table to the pull rolls 82. Holes are suggested at 86 in FIG. 13 as alternate mountings for the pin 86 in chains of table 240. It is of course necessary to fill the gum box 28 with the particular type of adhesive to be used. When all of these necessary adjustments are made the operator presses the main switch which may be carried by the control panel 230 on one of the uprights as suggested in FIG. 1. When the switch is turned on the motor 64 operates which drives the vacuum pump 62 and the several drive assemblies shown in FIG. 3;. The vacuum-friction wheel 52 delivers the sheet stock one at a time between its periphery and the pickup roller 68 to the tables 240 and 242 and the pins 86 of the chains 80 engage the trailing edge of each sheet and convey them along the tables to the pull-rolls 82. The number of sets and the locations of the pins 86 carried by the chain bears a definite and fixed relationship to a shaft rotation 24. The shaft 24 makes some whole multiple number of turns for each cycle of the conveyor chains 80. In the particular machine illustrated the shaft 24 makes three revolutions for each complete cycle of the chains 8%, and therefore the chains 80 carry three sets of pins 86 spaced equidistantly about the chains so that each pin bears the same physical relationship to the drum surface. Thus each sheet picked up by the pull rolls $2 and fed between the gum drum and wash roller engages precisely the same point of the drum surface, and the stencil carried on the surface of the drum registers the same way with each sheet delivered to the drum. The drum of course makes one revolution for each sheet delivered to its and applies the adhesive to the, particular areas required. In FIG. 8 the relationship between the pins 86, pull rollers 82 and drum 22 are shown. It will be noted that the sheet S being fed is disposed between the pull rolls 82 and has advanced ahead of the pins 86. The sheet is accelerated when it reaches the pull rollers so as to pull it Way from the pins. In this manner the pins cannot tear or otherwise mutilate the sheet as the pins round the sprockets 182 at the end of the horizontal run of the chains. Because the sheets are accelerated a they are engaged by the pull rollers and before they an engaged by the gum drum, the engraved reference line 200 on the drum must be specially spaced to take intt consideration this acceleration. In the machine illus trated the inch lines are spaced inch apart for thi purpose.

After the sheets pass between the drum 22 and th: wash-roller 42, the strippers 220 separate the sheets fron the drum 22 and direct them down the chute 224. Th wash-roller 42 cleans the adhesive from the pads 43 W116] in direct contact therewith because of the absence of a sheet to which the glue may be applied, so that during in termittent sheet feeding no glue off-set takes place.

If the motor 64 is temporarily shut down, the moto 160 continues to operate and drives the pickup roll 3' through its chain and sprocket 162, sprocket 164 an clutch 165 so that the gum in the box 28 does not harder The clutch enables the motor to drive the roll 30 and 34 without driving the rest of the assemblies.

Having described the invention in detail and the manne in which it operates, those skilled in the art will appre ciate that many modifications may be made of this inven tion without departing from its spirit, or the scope of th appended claims. Moreover, the machine may be used i1 combination with folding, sealing and drying equipmen as well as with other types of machines to achieve specia advantages. Therefore, it is not intended to limit th breadth of this invention to the specific embodiment illus trated and described. Rather, it is intended that th breadth of this invention be determined by the appendet claims and their equivalents.

What is claimed is:

1. In combination, in a machine having means fo feeding sheet stock upon which coating material is to 'bl deposited, a rotatable drum for applying such coating ma terial to sheets fed thereto by said feeding means, mean for supplying coating material to the coating material ap plying portions of the drum including means for meterin the amount of coating material applied to such portions 0 the drum, a wash-roller in contact with the drum for re moving coating material from said drum portions in eacl revolution of the drum after a sheet should have contactet therewith, said feeding means feeding said sheet stock be tween said drum and said wash-roller, and said wash roller functioning as a back-up roller during the feed 0 the stock therebetween, and wetting means for maintain ing the wash-roller clean of coating material.

2. The combination defined in claim 1, in which sail feeding means includes a conveyor for advancing tht sheets toward said drum, and means for driving said con veyor, means rotatably supporting said drum, and mean connecting said drum in driven relation to said dI'lVt means and constructed and arranged to enable said drun to be rotated a limited number of degrees about its axi without moving the conveyor.

3. The combination defined in claim 2, in which sait drum supporting means comprises a shaft forming par of said drive means, and indicia provided on the surfac' of the drum for establishing a selected registration be tween the surface of the drum and a sheet carried by th conveyor.

4. The combination defined in claim 3, in which sai connecting means includes means for locking the drum ii a selected angular position with relation to said shaft.

5. The combination defined in claim 1, in which sail drum portions are contained in a localized section of th peripheral area of said drum and comprise pads locate on the periphery of said drum and to the outer surface of which the coating material is applied by Said PPh ing means.

6. The combination defined in claim 5, in which stencil sheet is mounted on said localized section of sai drum and is identical in configuration to the sheet stoc P ll. Wh ch. the coating material is to be applied, sai

pads being carried by said stencil sheet and overlying the areas of the stencil sheet corresponding to the areas of the sheet stock to which the coating material is to be applied.

7. The combination defined in claim 5, in which each of said pads include a foam rubber inner layer and a smooth impervious outer skin for preventing coating material penetrating into said inner layer.

8. The combination defined in claim 5, in which said Wash-roller is positioned with relation to said drum to engage the outer surfaces of the pads as the drum rotates, and in which said means for maintaining the washroller clean of coating material comprises a bath in which the wash-roller is partly submerged.

9. The combination defined in claim 8, including means supporting said Wash-roller and said bath as a unit and enabling said wash-roller and bath to be moved as unit relative to said drum in a direction parallel to the longitudinal axis of said drum.

10. The combination defined in claim 1, in which said coating material supplying means comprises a supply box containing such coating material, a pickup roll and a transfer roll for transferring coating material from said supply box to the drum and said metering means including, a doctor roll disposed adjacent to the pickup roll for metering the amount of coating material applied to the drum, and eccentric bearings supporting the doctor roll, said eccentric bearings being rotatable to vary the spacing of the pickup roll and the doctor roll.

11. The combination defined in claim 10, including means for rotating said pickup roll and said transfer roll in the same direction, and means for rotating said eccentric bearings to efiect such variation in the spacing of the pickup roll and the doctor roll.

12. The combination defined in claim 10, including means for supporting said pickup roll, transfer roll and doctor roll in operative position relative to said supply box and said drum, and means pivotally supporting said roll supporting means and enabling the latter to be moved about such pivot to separate the transfer roll from said drum and the pickup roll from said supply box.

References Cited by the Examiner UNITED STATES PATENTS 1,484,753 2/ 1924 Augustine 118-258 2,337,052 12/ 1943 Kohler 118-203 2,357,824 9/ 1944 Haywood 118-203 2,511,781 6/1950 Minkow 118-262 2,601,507 6/1952 Eshehnan 198-162 2,625,085 1/ 1953 Bergstein 118-222 X 2,660,979 12/1953 Bills 118-258 2,674,225 4/1954 Burke et a1. 118-211 X 2,729,193 1/ 1956 Scholl 118-203 X 2,782,756 2/1957 Hunt 118-211 2,977,927 4/1961 Mehler et al 118-203 2,991,753 7/ 1961 Dearsley 118-262 3,011,913 12/1961 Pierce et a1. 118-210 X 3,141,667 7/1964 Novick 271-74 CHARLES A. WILLMUTH, Primary Examiner.

L. G. MACHLIN, Assistant Examiner. 

1. IN COMBINATION, IN A MACHINE HAVING MEANS FOR FEEDING SHEET STOCK UPON WHICH COATING MATERIAL IS TO BE DEPOSITED, A ROTATABLE DRUM FOR APPLYING SUCH COATING MATERIAL TO SHEETS FED THERETO BY SAID FEEDING MEANS, MEANS FOR SUPPLYING COATING MATERIAL TO THE COATING MATERIAL APPLYING PORTIONS OF THE DRUM INCLUDING MEANS FOR METERING THE AMOUNT OF COATING MATERIAL APPLIED TO SUCH PORTIONS OF THE DRUM, A WASH-ROLLER IN CONTACT WITH THE DRUM FO REMOVING COATING MATERIAL FROM SAID DRUM PORTIONS IN EACH REVOLUTION OF THE DRUM AFTER A SHEET SHOULD HAVE CONTACTED THEREWITH, SAID FEEDING MEANS FEEDING SAID SHEET STOCK BETWEEN SAID DRUM AND SAID WASH-ROLLER, AND SAID WASHROLLER FUNCTIONING AS A BACK-UP ROLLER DURING THE FEED OF THE STOCK THEREBETWEEN, AND WETTING MEANS FOR MAINTAINING THE WASH-ROLLER CLEAN OF COATING MATERIAL. 